ECU tuning, remapping, DPF, Adblue, and EGR are all terms that refer to modifications made to a vehicle's engine control unit to enhance its performance and efficiency. These modifications can improve fuel economy, increase power output, and reduce emissions. ECU tuning involves updating the software of the engine control unit, while remapping involves altering its parameters to optimize performance. DPF, Adblue, and EGR all relate to emissions control systems that can be modified to improve performance or removed entirely. These modifications may not be legal in all areas and can impact a vehicle's warranty or lifespan.